Oct 3, 2012 12:00am PDT
is in decline. researchers at the australian institute of marine science say the reef has lost half of its coral cover over the past 27 years. there are multiple causes, including a destructive kind of starfish shown here. we look at what's behind it and what's at stake-- in australia and around the world-- with nancy knowlton, a coral reef biologist and a chair of marine science at the smithsonian national museum of natural history here in washington. welcome. >> thanks. how has all of this coral died off? do we know what's causing it? is it all that... >> it's not all the star fish. the star fish is about 42%. typhoons, big strong storms another 48% and then coral bleaching is the remaining 10% which is caused whenever the water gets too hot. >> ifill: so this is human causedded? >> yes. most of it is human caused. i mean a coral reef naturally goes through cycles of up and down. but it shouldn't be declining by half over course of 27 years. >> ifill: i feel like we have talked before about the declining coral cover. but not... but i'm wondering whether it's now picking up speed or whether thi
Oct 4, 2012 5:30pm PDT
provided by: and by the alfred p. sloan foundation. supporting science, technology, and improved economic performance and financial literacy in the 21st century. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> woodruff: the first presidential debate is behind them, but the two sides went at it again today. republicans said their man took it to the president in the denver duel. the obama camp charged the truth got trampled in the process. >> la night i thought was a great opportunity for the american people to see two very different visions for the country. and -- (applause) -- and i think it was helpful to be able to describe those visions. i said the president's vision is trick-down gornment and i don't think that's what america believes in. i see instead a prosperity that comes through freedom. >> reporter: romney's reception at the event was reinforced by instant polling that he won last night's encounter by
Oct 4, 2012 12:00am PDT
results in just two days. the research was published in the journal, "science translational medicine." the paper reported the tests of just six newborns in neonatal units, but the implications could be widespread. roughly 20% of infant deaths in the u.s. are caused by inherited genetic conditions, according to the study. doctor stephen kingsmore led the research team at children's mercy hospitals in kansas city. he's the director for the center for pediatric genomic medicine there. dr. kingsmore, welcome, and thank you for being with us. first of all,-- >> thank you very much. >> warner: how big a breakthrough is this? >> this is a big breakthrough. we've been working toward this goal for a coup of years now. there has been a big gap between the knowledge that we have of genetic diseases, about 35% of them, and the ability for doctors to identify which of these was a problem in any given child with an illness. >> warner: and up until now, how much have you been able to diagnose the d.n.a. abnormalities? how quickly? i mean, i said it can take weeks and weeks, but what's the process t
Oct 6, 2012 12:00am PDT
, attention and enthusiasm, it matters which voters turn out where. dave robertson, a political science professor at the university of missouri st. louis, says the topsy-turvy election has cut both ways. >> one of the things akin has been able to do is electrify some of the conservative base. but there's a counter movement to that. and that is he's also helped electrify some of the female voters in the state, some of the moderate voters in the state, some of the key voters in the suburbs of this state that are going to determine the outcome of this election. and that's a real disadvantage for him. >> ifill: akin is counting on conservatives, home schooling parents, and evangelicals to rally around his cause. >> we don't tell you who to vote for, but i'm going to tell you how to vote. >> ifill: reverend stoney shaw, pastor of ferguson first baptist church, has known akin for 25 years. >> some of my family, my children were, "dad, how can you support him? everybody is turning against him." i said, "you know, there was another guy everybody turned against-- jesus christ-- but he prevailed.